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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d190b7c148f8c62be34ce699a3dd5cc72c5942baa51b60037241866cc8e1523' 
  AND token = 'umjCE3HiS9x66aS2T9foY3TjCSpMii1GP/ulqwVL1m4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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