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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bdc9acca1c5b75c404a7668e5368e9d0dc84bbe6854a8fc19e6f48b8e10b145' 
  AND token = 'laowKDfuXbALhitP8astT5oo+bUcyv1687NwGvLetpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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