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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4eaadbc5881f8d0d8eeae6da936f7340052064ae9d2250ead41c464dc394d70' 
  AND token = 'fRrngeDFYK93ggrwYM86tL/CdDoL/HKBgsOXVVbrex4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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