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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb00d7833a2f147516f8f63697b1c3795dc366cc992639eb1ec604793ce0a00d' 
  AND token = 'PBRkPHWCvNkSh99I7B2HpVlifSyvwm+BbJzerJALLcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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