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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53e80d99c6ef9a6cf20051c334a49b4891c2584f5eb2aee7e78c554793211486' 
  AND token = '09LRyYLywdF4mr9J0LbcRrH0Syd/LfLt3uozpkjaK1E=' 
  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"
    }
  }
}