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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f1ecf0d9773cad6c085cb7bca5c22bec9fe69e9a944f457c806bfbf05e76efe' 
  AND token = 'D6fjaRm+8gDtEeJKvlqytfSiTHCUOq/ElQ3kCxguDX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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