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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ecf9e5f7a56eb7ee6b1bbf7e0ce09f941c191c72e04cc9791b56a17d9cff461' 
  AND token = 'iu5/9E7o/JTyzvk9EP46sLzS1mnKQzg2dAt5mIcO7yg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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