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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '888a0d4e7124e968d42e80a5d0212207be32f24ba3c05873b05ec8cf4f3b8dd9' 
  AND token = 'eS54DS43ClbHX/tgAA6WJ3hFW+crrazPlOLz7aJiCZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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