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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b60dfde8e8ea5d14230c89a6aa07e800ab9daa8696f80fab1d6fddb2fdd1c42' 
  AND token = 'Gs9UtyH+vidR85AZ0Xrc/E91SsM8Pb3LwMVdr6dJRfs=' 
  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"
    }
  }
}