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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a17320a7c14a5bc11281451591dbf74e9c69f2bc9024c6baca7d007393310ee' 
  AND token = '9DycoFMJd7NiTNzLA0RN3feD6Fc433mptdD3LO6rUDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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