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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f6e1eba4c93a643fbe9df99f9e09c8b58c04120e4dddfa51f073e3b4cbe1aea' 
  AND token = 'gT2FwDxLL5am6eJcjRNN96iwlyY0jk4crGDiHfGpGkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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