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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '786a769491f703d2bf9a1ec472e52bede08c81fe5acbdaa6a40a5ffe0d6d5539' 
  AND token = '8PBQLdTsT1899Ldu0MogmONCsrIAeFcpW//XqZz5k6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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