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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72e4c6057718b1681d725eaf8ef9bce521b4765b21d0bf24f34e10e941ced56f' 
  AND token = 'IAQ33m7PzZVVjyl/mEB+X2dsSddBAQIlzxUxcTchmVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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