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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0bbd26437e08e7b830babcbc51ddcfa1f1254a405a4c013e3263d370e9f34e4' 
  AND token = 'RfqwY1y5Z7sfM6v8H96M0N0m99RpqdS+d1sQsq9cV/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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