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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11349d72c99030a67fc26e6ccf4db47a357e03a949ed3ffb05d32977622f310b' 
  AND token = 'Ubrcn75/6RQIQL0YRCCJLXwvUSmUFqmmm5ZXjzP403E=' 
  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"
    }
  }
}