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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72157dc4c7bad6c2416acd4333ddbce1065f51dd4a18e75087d8de0eefa28a51' 
  AND token = 'bK+LlihXQq1BoMT6k6B+hrmU3HBhwvVF0mE8gtZBgUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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