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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8118de62ed73929a3fb42117daf89ed8e53e881db7a14aca3eb74e673e1d8c2' 
  AND token = 'pl2hVsJKbXmJxTAn0U2QTkkqLfkrbIzwSM4kc07Riw4=' 
  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"
    }
  }
}