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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b47419b51c8100c6152da1ec910777c0e06523ef6cf91b1068701f324e1a92bc' 
  AND token = '3QsDXvAUVvpV0bIvZYpEceHURtKFVr9dnnvVE5wbUYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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