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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b8b75c3f93c43c43ac60cc6aceca894ddb3d81b48151b503b3cf9c760673333' 
  AND token = 'hmD21lZyN6mY8ASw+4fXAmmU8F6rwNdXtl66ugS5MKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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