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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cb2e1df027f3c231abb84d0baf87fe20d5d9ad9619d73aca3e5fc4130df45b1' 
  AND token = 'RH5/qozY/te+8sRPVGl9HD+CCKaf+a91oC4bbUTaguU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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