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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da5336eb3afa84954b762fb9a2d26bf6ff10f4641badf23333a3d5cf9edb115d' 
  AND token = '90KjYf6jM4p5ZdZDmYZml+ggAp5deZLnYE4DKJm1NfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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