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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '928d9b03e7701c79187aaf26e426af20f1e86535610fcbef9f88661002f58523' 
  AND token = 'OwbGfbmC91WgSxIHGMt4VyWSYSkNeLG6xDUrQqmfXCg=' 
  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"
    }
  }
}