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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd73c26a63c5a58927ffbafb2d0cfb5ec43ebb833bc21c4dbe8cb32360c81c63d' 
  AND token = 'JuC1ksTXt1SW0VqXvJ6ZYV8vznnp75h26SEbuQQ3B/A=' 
  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"
    }
  }
}