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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ab8de67c95043ec6eaa82f635583e984f6fb2a7e6d0a8d8b5a137bb586dc2c3' 
  AND token = 'ngCPBDZhcjf2I87uxpqvwbal5Mbg3XFQQQe5B2Z2FX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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