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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5b4230fa72067bfae9fd113b9e17843d15d1b0fdd3dc9c7866867c397adf9d2' 
  AND token = 'eGd2P+hOTX4DTFmjSLMvYEgFe1urMW3O4mNgbOGpwZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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