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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b165446126a61d1d3024fd147a61019d388c2a6b0c622bb309084b2687e7810c' 
  AND token = 'cQkwUv6PrTQJEP6zMArXYdo+IerbQL/5jQLj39sRqLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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