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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c0cb2f63d91511cad5803e91b929d02ef866862b8276d340d7bd4d8c6130e8e' 
  AND token = 's8ftj8avyy2rRlw9CVz4dWLX3eh3+KjcAfVijlTiKF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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