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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79f941807c7043877527cb7aaa97873e6504596a952bf839c5d6e94c7d3ae0b0' 
  AND token = '5Xu75bJ98Aono1qpQKycIMyyXm4iiw87dpbSTX0WR74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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