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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e3338174dd1be45fe58caca69d38638b26b957860b98d1d5ec1947ba2c13eb1' 
  AND token = 'ZCEk5uH8PrHSRblHxJsiLdAYIRk/0LZ4Hgq1PJ+gmC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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