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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4b6b4d724e9231e065ee2bcd2a08af2e385e8b705e4f368934040a37b592d6f' 
  AND token = 'jt5S4CQLgSFQoX/zrXtNzqo+i+0b7T0w/NpGND8fJUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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