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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0535bfa9bdfcdc5bd87f4b0b60298e4800e3a93197687ec3ab934d66d9ff4e6b' 
  AND token = 'C68ws5KfKX6mOLis+ytPJ9NHIG49bPofzb3/r46UjVc=' 
  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"
    }
  }
}