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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '968f1d6418e6abfa791a7164e19d322b7f0c69d5fb81a17ee811994f0956c802' 
  AND token = 'MJE6BoVa/HtTO6s12YE06yDzkisZUF98NDUMUhlOcmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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