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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd00b29713410762628457190ad8498b7df56a76e42c64998b294c994256e5fa' 
  AND token = 'EBAAk4+XotU1KHM/Z9e0kd94K+PDiUVe81pUVayeBP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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