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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90de0e030e1d59d7f36d94a57a8a944ea8d2813bd25ac1bf84071c84158c94b0' 
  AND token = 'EpupsGaqcoCLoCKZTOBlTc3yxUKOH9zPdDm6cB507a8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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