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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c6d8bafd72e6251f1b65234f9b31baee7722b76351f267c5b35d72dcc838c89' 
  AND token = 'bHhCkPLbirNxJ2kiTA7wc8Zpczj4ccz7lp8jLZqlcLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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