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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3c012633d7b6e50477a6c82b632f017dc8c185c0f130fef295ddbcbeea55baf' 
  AND token = '2YyS82ZOAxpnDb7toAqpv49pXvKwtoj3xNNW/Sgy1kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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