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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b688fef40fc34d75ebc9d41e5e7f06daff799f048d0850b19c2521008671f6d3' 
  AND token = 'vTlEhcgKK2d2Amz3E88BdLX9WJLGh/T0wTCeN9DM4/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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