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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10f456a2599a27ff148ccdd3a295219c475a7f506c27513e913a2dcd1cf93f9b' 
  AND token = 'CCZ0XFmNchhmjG9F+gr8P45j2bqovc5Y6rWHbzyZd9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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