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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c70dcafdbbc395a65ad6a26f02ff28652d48c21bae57a988a9494d0114f87e5a' 
  AND token = 'N7eBIPtwb9M0CJYRgJLE7yw35zbsfRYq4x3/nJofRqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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