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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21fd441930b22904452a88670884ad8c0f23625482c33db92758d916377d3e4f' 
  AND token = 'yDxJwdjq9zxFLfhkOkrvvP3f936D500O/ThBexyN9n4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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