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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26a4f250fa97dca5ba30e7398e9996ebbb738bef3687e4142d6d7e75064b1707' 
  AND token = 'G7b42AOZlhfEiq7bdK0XhOrPfUgpaL52eX3sz8zvp5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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