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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f29739d8fc9bdc9111e76d13387a34522b75e7c38609f0d51fcb501e8a8c49a9' 
  AND token = 'lJTO0CN0+l9Z0/VnAp7hxZHe6an78pGiZ0jK3F1Heq0=' 
  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"
    }
  }
}