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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26cd2268e7f1ca1dc79a89842891311c0b76e393a049c30efd75f87ee72f5c87' 
  AND token = 'noxv4n+y9bsNqnypT+iT3fWPjI/4AVXaZeWtgEsLNZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}