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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d4e9d604932270a768218493b7d5b898eee9b0cdf459ec195bc856cf5c9bede' 
  AND token = '8a58lcNGqjhx2kOCiikcWllbdwtEPJdruqwQo7YAX+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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