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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd2064db87dfe4ddeaff1a1180751dc1c8ee7135fe8da7e2e7e681e29bb7b3e0' 
  AND token = 'YXd30XmdRqTw0QxfCbkSIjCH6RH1W0vhYrUfWPclDXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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