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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a284398f4a358912ceceec46d08319e050333047e760a565c3bbdf2620ededd2' 
  AND token = '/kBbIoP9vmKIKsSUykfEn+KeRB7stbpWG+oR4wYt/PI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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