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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '824e3f796d35f766f80068cfc2b2bec75aeed168b3c5198918be229de7dff358' 
  AND token = '2xc+bke9YhYDmFddynpMPoZ1x0qMD/tYUOVHWNKSCFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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