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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e136d8661b0604bb383fddf44e9c9f5d5f1396af138b16bf0b5373da41419d2' 
  AND token = 'K09yq9FLyVbuAumV29jF3jIrkEOUGtAAANaD1UWXtfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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