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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dff8193e8cfd9365bc28f88e30fed3c43b0598d09a0ec21727970bdd7c7fa946' 
  AND token = 'r8RJmNtfISbdfP94ZCeXjpqOW7hxyZgljlJp7VPI7ls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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