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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c15e786694c47a6af44af297b1a793b8b01ea5c097903edf7eed4b1762de57a' 
  AND token = 'f3ViUYj5LypzuPOykpDRY7JEAVXk7jS0fM1XEaYOh2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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