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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2628feb53a782612af9046b5e4d433d847d64be004b2457b87ac92be7f27bac8' 
  AND token = '1ZBTyzK03BTjk3gSnLOC4zGLkZDtvKPrxDmXbNk7mO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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