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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9f45e7cf80a6ba3643a2272da09c54b38c746e9c774c76c6c4b74e3738c5fa8' 
  AND token = '86WP3VgsL9iEuJpPO+w0rQeS5Sh7swCYDgLtucm4Cn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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