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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2bdadd40bbb1e713b833c817bb246c2e24d7f3c0e5c0c86ecbf28b0093f9d8e' 
  AND token = 'j3G4kxxqsUIsn9I4ZK6XSMnbNhmA0J0ynifOyyHoe9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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