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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c6edf34f8e2cd38f0815d5fa279b35d2f4160255c510eefafa69576e05c8ba8' 
  AND token = 'JA0G6fLD4L6jP/8rjh8rNZe1vACpx7v6yYI5KX3JL5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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