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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5385fcd707d60edd73aef95dd6ac0864de38c220cce82621b5cb7c464f9c486' 
  AND token = 'upvIpzuvD4qJgNzQPmUnF2nzakCX8+l6kdl0Yep85+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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