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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c37506dd55513ecc5356bf056a8a0c048346b7c7be8eb3f93fbf9fa9aaf3fb2' 
  AND token = 'VondKqS3ncFCk+wwNnJJrDfs704xEUN5KayE6ZZI9v0=' 
  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"
    }
  }
}