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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a8e98c3091f901c256d01afde0bb026bb911ee6e49d2acb349daa550383b70a' 
  AND token = 'gKqc8wfvPYs1r/5Hj7+HT4r+Tse4Z5arc6TnwMSY+Cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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