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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a43d8358fa12f0d4ef3989a09f0dc64268bf523c85cb312fe2ff4e071e35cf1' 
  AND token = 'ShkysDk14FfmXuH49ONw/aCqslqg8H+xqg9/c9C/2q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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