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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08c85f16c3e777b8181e66bf0a3da29eeab86de9c560b4a82d4469e0b4b0326e' 
  AND token = '/kBLDtuQCTSDD+sfxsSBZIYpGc9ixJ4UMtY0L5IrgYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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