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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4c0faa7fdcff0b3b0a4b80fbf9b74e7821693d314577dad16160b750edf5409' 
  AND token = 'iFGQDLXcMKOQppgz35iD4DmJWa/0PaJDsMXkC92iAZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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