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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbe4e0b1e42e8a9b92c036ce591652266a17664d6f1a4edb107e97b72396ac2d' 
  AND token = 'k8eKIS7FlVm0x+duekrWOMWWAz++g/PUIJO21JagPwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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