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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0eced889c2a45cbe85d84d2939954c24c782c1c727c2875ef23893e776044e96' 
  AND token = 'ayRUjOmaOvdI6EGaTSUqJZj62Tt7wtc2+HPGpTQ2Cyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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