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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd80cbccff54a9a8e6ca195d351fd4351beb136ef4695a7246299ba2be27100ee' 
  AND token = '2rV+YZZ5U3OMsa0BScu8kJxcAiI7eniMxmgFN3/0veA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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