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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cea54ec290b7755d3dee62e444cc517173e4b44e32d89a4ac9d1c5e514c259a' 
  AND token = '2/9+RVWEcKsOXDqBwuUV1CIWrbTIJLGcoL/6hR6Kpnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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